Suppression of Electromagnetic Harassment in Vehicle Micro-motors Gu Yuzhi (Shanghai Valeo Automotive Electrical System Co., Ltd., Shanghai 201203, With the development of automotive technology, the user's convenience and comfort requirements for the use of automobiles are continuously increasing, and more and more Electric devices are used in automobiles, which generate electromagnetic harassment during use, and affect the normal use of on-board electronics, telecommunications equipment, and radio broadcasting, etc. CISPR25 (International Standard for Electromagnetic Harm to Automobile Components) The limits of the electromagnetic disturbance caused by the conduction of wires in the motor drive are used in various types of motors (eg, generators, wiper motors, door lock motors, rearview mirror motors, etc.). Large car manufacturers have also formulated corresponding standards, such as: In the TL965, GM9114P, GM9115P and other standards on the electromagnetic disturbance limits of the motor are clearly defined.
1 Adding an electromagnetic disturbance suppressor Absorbing and suppressing electromagnetic disturbance sources to be absorbed and suppressed on the power line By adding a different combination of capacitances on the power line (Capacitor capacity between tens to hundreds of microfarads) Absorption and suppression of electromagnetic Harassment minimizes the impact of disturbance sources on the outside world through wires.
1.2 Provide a low-impedance path for the disturbance source of the motor. By adding suppressors of different specifications to compensate for the effects of delayed commutation on the motor, improve the electric balance performance during commutation, and effectively suppress the generation of electromagnetic sparks to achieve suppression. The purpose of electromagnetic harassment.
2 Example analysis of the electromagnetic disturbances that were actually encountered and resolved when the vehicle was used to develop headlamp light regulators (hereinafter referred to as light regulators).
After a large number of tests and analysis, after adding a suitable suppressor to the motor, the electromagnetic disturbance amplitude in the high frequency band is effectively suppressed, and the disturbance voltage value that has not been suppressed by the electromagnetic disturbance is achieved (Table 1 shows the test data shown in Table 1). It can be seen that in the low frequency range of 0.15~0.30MHz, 0.50~1.6C5MHz, and 5.95~28.0MHz, the frequency bands of the Shanghai Volkswagen Passat and POLO headlamps light regulators without electromagnetic suppression have no suppression. The electromagnetic disturbance limits can meet the requirements of L6, M6, and 52 of the TL965 standard, but fail to meet the minimum standards for electromagnetic disturbance limit U1 in the high frequency range of 65 to 108 MHz (after suppression of electromagnetic disturbance on the power line The disturbance voltage value shows that the suppression capacitor installed at the input of the motor has not achieved a significant effect or even worsened the suppression of the small-sized motor with three commutator segments actually used in the 65-108 MHz frequency band. Some of the measured waveforms are shown.
2.3 Adding a suppressor to the rotor of the motor after the disturbance source of the motor is harassed by the disturbance voltage. From the test results (), for the small-sized DC motor, the suppression of the motor disturbance source is 65~ The inhibitory effect of the disturbance voltage at 108MHz high frequency band is very obvious. The actual test has reached the L6M656U1 standard. The measured waveforms are as shown.
Table 2 Shanghai Volkswagen Passat, POLO car headlights light regulator after the power line electromagnetic disturbance suppression disturbance voltage value comparison frequency) 5MHz disturbance voltage maximum 5B! V1081Hz harassing voltage diagram “Disturbance voltage waveform of light regulator after processing by disturbance source suppressor Conclusion For the suppression of electromagnetic disturbance generated by small (miniature) DC motors, it is necessary to first improve the commutation conditions of the motor and commutate the spark of the motor. Control below level 1.5, try to minimize the electromagnetic disturbance of the motor itself, and then use the appropriate suppression measures to achieve the best results based on the test results of the distribution of electromagnetic disturbances (Editor Yao Yue) ☆Direct remittance to CCS Subscription 2004: "Electrical Appliance" monthly publication, annual 60 yuan (Automotive Electric Appliances) 2003 hardcover bound volume for each 38 yuan Bank of China 16 open (210mmX! 97mm), the purpose of its publication, column The setting and article selection criteria are the same as those in the official publication, and a collection of excellent articles by well-known authors, with 128 pages of text, rich content, fine-tasting, excellent value for money, and high-quality periodicals.The supplement is published by the magazine itself (only this magazine has (sales), domestic pricing has been reviewed by the competent authority at 16 yuan per copy.
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